/*
 * FS_IOC_FIEMAP ioctl infrastructure.
 *
 * Some portions copyright (C) 2007 Cluster File Systems, Inc
 *
 * Authors: Mark Fasheh <mfasheh@suse.com>
 *          Kalpak Shah <kalpak.shah@sun.com>
 *          Andreas Dilger <adilger@sun.com>
 */

#ifndef _LINUX_FIEMAP_H
#define _LINUX_FIEMAP_H

struct fiemap_extent {
	__u64 fe_logical;	/* logical offset in bytes for the start of
				 * the extent from the beginning of the file */
	__u64 fe_physical;	/* physical offset in bytes for the start
				 * of the extent from the beginning of the disk */
	__u64 fe_length;	/* length in bytes for this extent */
	__u64 fe_reserved64[2];
	__u32 fe_flags;		/* FIEMAP_EXTENT_* flags for this extent */
	__u32 fe_reserved[3];
};

struct fiemap {
	__u64 fm_start;		/* logical offset (inclusive) at
				 * which to start mapping (in) */
	__u64 fm_length;	/* logical length of mapping which
				 * userspace wants (in) */
	__u32 fm_flags;		/* FIEMAP_FLAG_* flags for request (in/out) */
	__u32 fm_mapped_extents;	/* number of extents that were mapped (out) */
	__u32 fm_extent_count;	/* size of fm_extents array (in) */
	__u32 fm_reserved;
	struct fiemap_extent fm_extents[0];	/* array of mapped extents (out) */
};

#define FIEMAP_MAX_OFFSET	(~0ULL)

#define FIEMAP_FLAG_SYNC	0x00000001	/* sync file data before map */
#define FIEMAP_FLAG_XATTR	0x00000002	/* map extended attribute tree */

#define FIEMAP_FLAGS_COMPAT	(FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)

#define FIEMAP_EXTENT_LAST		0x00000001	/* Last extent in file. */
#define FIEMAP_EXTENT_UNKNOWN		0x00000002	/* Data location unknown. */
#define FIEMAP_EXTENT_DELALLOC		0x00000004	/* Location still pending.
							 * Sets EXTENT_UNKNOWN. */
#define FIEMAP_EXTENT_ENCODED		0x00000008	/* Data can not be read
							 * while fs is unmounted */
#define FIEMAP_EXTENT_DATA_ENCRYPTED	0x00000080	/* Data is encrypted by fs.
							 * Sets EXTENT_NO_BYPASS. */
#define FIEMAP_EXTENT_NOT_ALIGNED	0x00000100	/* Extent offsets may not be
							 * block aligned. */
#define FIEMAP_EXTENT_DATA_INLINE	0x00000200	/* Data mixed with metadata.
							 * Sets EXTENT_NOT_ALIGNED.*/
#define FIEMAP_EXTENT_DATA_TAIL		0x00000400	/* Multiple files in block.
							 * Sets EXTENT_NOT_ALIGNED.*/
#define FIEMAP_EXTENT_UNWRITTEN		0x00000800	/* Space allocated, but
							 * no data (i.e. zero). */
#define FIEMAP_EXTENT_MERGED		0x00001000	/* File does not natively
							 * support extents. Result
							 * merged for efficiency. */

#endif /* _LINUX_FIEMAP_H */
